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Day 405: JEE Mains Chemistry

5 questions. Try each one first, then open its answer.

  1. Question 1

    Haloalkanes and Haloarenes. Asked once: 23 Jan 2026 S1

    49
    Consider all the structural isomers with molecular formula C5H11BrC_{5}H_{11}Br are separately treated with KOH (aq) to give respective substitution products, without any rearrangement. The number of products which can exhibit optical isomerism from these is ____\_\_\_\_ .

  2. Question 2

    Hydrocarbons. Asked once: 4 Apr 2026 S2

    39
    Compound ( X ) is subjected to the sequence of reactions as shown above. Molar mass of the major product (Y) formed is ____\_\_\_\_ gmol−1gmol^{- 1}. (Given molar mass in gmol−1C:12,H:1,O:16gmol^{- 1}C:12,H:1,O:16 )

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  3. Question 3

    Organic Chemistry - Some Basic Principles and Techniques. Asked once: 28 Jan 2026 S1

    49
    0.53 g of an organic compound (x)(x) when heated with excess of nitric acid (concentrated) and then with silver nitrate gave 0.75 g of silver bromide precipitate. 1.0 g of (x)(x) gave 1.32 g of CO2{CO}_{2} gas on combustion. The percentage of hydrogen in the compound ( x ) is ____\_\_\_\_ %. [Nearest Integer] [Given : Molar mass in gmol−1H:1,C:12,Br:g{mol}^{- 1}H:1,C:12,Br: 80, Ag:108,O:16Ag:108,O:16; Compound (x):CxHyBrz(x):C_{x}H_{y}{Br}_{z} ]

  4. Question 4

    Organic Reaction Mechanisms. Asked once: 3 Apr 2025

    107
    The major product (P)(P) in the following reaction is P Major product \underset{\text{~Major product~}}{P}.

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  5. Question 5

    Solutions. Asked once: 7 Apr 2025

    108
    Liquid A and B form an ideal solution. The vapour pressure of pure liquids AA and BB are 350 and 750 mm Hg respectively at the same temperature. If xAx_{A} and xBx_{B} are the mole fraction of AA and BB in solution while yAy_{A} and yBy_{B} are the mole fraction of AA and BB in vapour phase then :

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